When registering a new user, I understand the "username" must be unique. However, it also shows an error (This name in already in use. Please try with a different name) when writing a Name already in use. I don't agree. If two users want to have the same name (Javier Garcia) but different username, it should be allowed.

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In kune groups and users are almost "the same" internally. So, imagine that you register some group called "People's Front of Judea" to have to groups with the same name can me a mess. It's better than other groups use different names as "Judean People's Front" to avoid confusions, etc...